What thing is called as 'skin-colour' in my oil-pastel box surprised me because it was white+orange (later I knew it matches Europeans' skin's colour whereas we were brown.)
However its etymology is just tradition, and I think anyone shouldn't take it in sensible way. Its just as simple.
Artists are usually never obsessed with packaging-name of the colour... but they show obsession to the look or sense of the shade of colour. They effortlessly imitate a natural-colour by mixing more than one colors in their palette... just on eye-gaze.
If you want to make the proper shade of someone's skin's colour; you could try different available shades of yellows, browns, oranges, reds, whites, blacks, greys or even little proportion of greens or blues may require.
As some hints, could use ochre-yellow, burnt sienna, raw umber, crimson-red, scarlette red, gamboge yellow etc. from your colour-set, in proportions as required.
Even if the colour-shade varies from country to country/ brand to brand/ medium-to-medium; the difference is probably not so drastic . For say if you get 2 shades of yellow ochre; possibly the different is not so drastic that one is totally brown and another is totally yellow. With slight color-mixing the desired shade could be easily derived. Seemingly you could easily do that, (because since you're using oil-painting that means previously you've learned drawing many years with someother media).
More-over, if you have the accurate shade that matches to desired-one's skin; still you have to mix some-other colour since you want 'realistic' thing. To make the dark, bright and highlighted portions of the picture of same-person; you must need mix colour in complex way otherwise everything will look flat.